Beveling device for rubber tubes



A. E. FALOR AND F. MACDUNALD.

BEVELING DEVICE FOB RUBBER TUBES.

APPLICATioN FiLED AUG.27,1920.

l ,LD Eatemed Dec. 28, 1920.

PATENT l .BRAM E. FALOR AND FRANK J'. MACDONALD, OF AKRON, OHIO, ASSIGNOZRS TO THE B. F. GOODRICH COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

BEVELING DEVICE FOR RUBBER' TUBES.

T0 all whom t may concern Be it known that we, ABRAM E. FALoR and FRANK J. MACDONALD, citizens ot' the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Beveling Device for Rubber Tubes, of which the fol` lowing is a specification.

Thisinvention relates to means for pro` ducing a taper or bevel at the end ot a rub- `ber tube during vulcauization as, for example, in the manufacture of inner tubes for automobile tires. In this instance, a straight tube, having` been formed ot uncured rubber, is placed upon a cylindrical mandrel and vulcanized thereon, then removed therefrom and its two ends joined to gether to form the annular inner tube. It is desirable that the walls of the tube be tapered toward the ends in order to make a telescoped beveled seam.

l-lerctofore it has been the practiceto bind the ends of the tube. while on the mandrel and before vulcanization, with binding tape, so that when the rubber is subjected to the vulcanizing heat and becomes plastic it will permanently yield to the compression oft the binding tape and assume a tapered t'orm in the vulcanized product. The use ot binding tape is slow, and since the tape must be scrapped after each vulcanization, it is efrpensive.

The object of our invention to provide quick, 'eflicient and economical means for the purpose above described, and to produce a more regular tapered form than has here tofore been obtained.

Of the accompanying drawings:

Figure 1 is a perspective view of a preferred form of our beveling device, showing the manner of using the same.

'Fig 2is a side view of the same, partly in section.

Referring to the drawings, 10 is the bevcling sleeve, 11 is a mandrel and 12 is an uncured rubber tube thereon. The sleeve 10 is resilient and formed of sheet metal, having a flared or truste-conical portion 13 at one end anda cylindrical portion 14 at the other end to bear on the mandrel. lt is eut through longitudinally on. one side, as-

shown at 13a On each side of the longitudinal cut is a relatively short transverse cut 15, approximately at right angles thereto, in the cylindrical region of the device.,

Specicatin of Letters Patent.

Patented Dec. 28, 1920.

Application ined August 27, 192e. serial No. 40er/2.

drel as indicated in Fig. 1 and is then al- Y lowed to contract onto the end of the rubber tube, approximately' to the position shown in F 1g. 2, before vulcanization of the tube. Dining vulcanization, the flared portion ot the sleeve compresses the end of the tube against the mandrel and causes it to assume pern'ianently the desired tapered or beveled form. the bridge 19 preventing the escape of rubber through the out 13a.

The device may be quickly applied and removed, produces a smooth and even taper ot the rubber surface and may be used over and over again.

We claim:

1. In combination with a cylindrical mandrel, a removable flexible sleeve formed with a longitudinally divided truste-conical portion adapted yieldingly to. embrace the end oi a rubber tube upon said mandrel.

2. In combination with a cylindrical man-- with a frustodrel. a flexible sleeve formed conical portion splitlongitudinally, and with means on each side 'of the split adapted for `engagement by an expanding means.

ABRAM E. FALOR. FRANK J. MACDONA TD, 

